Pulley equipment

Abstract

To provide a pulley device capable of performing arm stretching exercise.SOLUTION: A pulley device includes: a loop string including a ring-shaped loop portion formed in an upper portion and first and second string extension portions extending downward; a loop fixing stopper through which the first and second string extension portions pass and to which a loop portion can be connected to form a knot; and a pulley to which the first and second string extension portions are connected and which includes a pulley wheel.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] FIELD OF THE INVENTION The present invention relates to a pulley device, and more particularly to a pulley device that can be used to connect a pulley to a support using a loop string. [Background technology]

[0002] A pulley is a device that moves an object by attaching a rope or the like to a pulley wheel. Pulleys are primarily used to change the direction of force.

[0003] A known pulley includes a pulley wheel and a pulley housing that rotatably supports the pulley wheel. The pulley is used by fixing the pulley housing to a support and hanging a cable or the like around the pulley wheel.

[0004] A known pulley has a metal hook, ring, or pinion on a pulley housing to fix the pulley to a support, or a bracket to fix the pulley to a support by fastening a bolt. Such a known pulley structure has a drawback in that the work of fixing the pulley to a support is cumbersome in order to use the pulley.

[0005] For example, when a pulley is fixed to a support for the purpose of lifting an item using the pulley, it is difficult to use if there is no adjacent support to which a hook or the like can be fastened.

[0006] In recent years, pulleys have been used as exercise equipment for rehabilitation therapy. For example, Korean Utility Model Publication No. 20-1999-0001642 discloses an exercise equipment using a pulley. However, such a known pulley exercise equipment has a problem in that the pulley must be fixed to a fixed surface on the ceiling using a bolt. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Korean Utility Model Publication No. 20-1999-0001642 Summary of the Invention [Problem to be solved by the invention]

[0008] SUMMARY OF THE INVENTION An object of the present invention is to provide a pulley device in which a pulley can be easily connected to a support base using a loop string and the position of the pulley can be easily adjusted.

[0009] Another object of the present invention is to provide a pulley device that allows for arm stretching exercises. [Means for solving the problem]

[0010] A pulley device according to one embodiment of the present invention includes a loop string, a pulley, and a loop fixing stopper. The loop string includes a loop-shaped loop portion formed on one side and first and second string extensions extending from both sides of the loop portion to the other side. When the loop string is hung on a support base located above, the loop portion extends downward together with the first and second string extensions. The loop fixing stopper has first and second rows of through-holes through which the first and second string extensions pass. The loop portion, which is turned around by the support base and extends downward, can be hung on the rear surface to form a knot that secures the loop string. The pulley includes a pulley housing to which the ends of the first and second string extensions are connected, and a pulley wheel rotatably mounted by a connecting shaft between connecting plates on both sides of the pulley housing. A groove is formed around the circumference of the pulley wheel through which a moving string can be rotated and passed.

[0011] According to an embodiment of the present invention, the first and second rows of through holes of the loop fixation stopper include upper through holes that allow the first and second string extensions to extend from the rear surface to the front surface, and lower through holes that allow the first and second string extensions to extend from the front surface to the rear surface.

[0012] According to an embodiment of the present invention, the loop fixing stopper includes a main plate in which the first and second rows of through holes are formed, and side walls protruding rearward from both sides of the main plate. The side walls allow a loop portion, which is hooked between the rear surface of the main plate and the first and second string extensions, to extend between the side walls. As a result, the loop portion interferes with the first and second string extensions, firmly fixing the loop string.

[0013] According to an embodiment of the present invention, the pulley housing includes a string coupling part formed on an upper surface thereof as a through-hole through which each end of the first and second string extensions extends, and the ends of the first and second string extensions inserted through the string coupling part are fixed to a coupling space formed at an upper portion of the interior of the pulley housing so as to be prevented from coming off.

[0014] According to an embodiment of the present invention, a moving string having two moving string extensions that are hung on grooves of a pulley wheel and extend downward, and handles connected to the lower portions of each of the moving string extensions, are included, allowing for arm stretching exercises.

[0015] According to an embodiment of the present invention, a handle has a hollow through which a moving string extension is inserted, and the moving string extension is provided with a string stopper that connects the handle and allows the height of the handle to be adjusted. The string stopper has an insertion hole path and a fixing hole path formed inside its body. [Effects of the Invention]

[0016] According to the pulley device of the present invention, the pulley can be easily connected to the support base using the loop string and the loop string stopper. Also, the pulley can be easily suspended in the air from the support base located at the top using the loop string, and the suspended height of the pulley can be easily adjusted by moving the loop fixing stopper.

[0017] The pulley device according to the present invention can be used not only for lifting items or pulling objects, but also as an arm stretching exercise device for rehabilitation therapy. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a perspective view of a pulley device according to an embodiment of the present invention; FIG. [Figure 2] 1 is a perspective view showing a pulley device according to an embodiment of the present invention connected to a support base. FIG. [Figure 3] 1 is a cross-sectional view showing the connection between a loop string and a pulley in a pulley device according to an embodiment of the present invention. [Figure 4] FIG. 2 is a front perspective view F of a loop fixing stopper according to one embodiment of the present invention. [Figure 5] FIG. 10 is a perspective view of the rear surface B of the loop fixing stopper according to one embodiment of the present invention. [Figure 6] 10A and 10B are diagrams illustrating the connection of a string to a loop fixing stopper according to one embodiment of the present invention. [Figure 7] 10A and 10B are diagrams illustrating adjustment of the length of a loop string and adjustment of the height of a pulley by moving a loop fixing stopper in a pulley device according to an embodiment of the present invention. [Figure 8] FIG. 1 is a perspective view of a pulley device with a movement string and a handle connected thereto, in accordance with one embodiment of the present invention. [Figure 9] 1 is a cross-sectional view of a string stopper of a pulley device according to an embodiment of the present invention. [Figure 10] 10A and 10B are diagrams illustrating a method for adjusting the height of a handle using a string stopper of a pulley device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, specific details for carrying out the present invention will be described with reference to the accompanying drawings. In describing the present invention, detailed descriptions of related known functions will be omitted if they are considered to be obvious to those skilled in the art and may unnecessarily obscure the gist of the present invention.

[0020] FIG. 1 shows a pulley device according to one embodiment of the present invention, FIG. 2 shows an example of use of the pulley device according to one embodiment of the present invention, in which the pulley device is connected to a support base, and FIG. 3 shows a pulley device according to one embodiment of the present invention in which a loop string is coupled to a pulley housing.

[0021] Referring to the drawings, the pulley device of the present invention includes a loop string 100, a loop fixing stopper 200, and a pulley 300.

[0022] According to one embodiment of the present invention, the pulley 300 is connected to a rod-shaped support base 10 via a loop string 100 and suspended in the air. The support base 10 may include various structures on which the loop string 100 can be supported, such as a straight rod or a bracket fixed to a wall.

[0023] The loop string 100 includes a loop portion 110 in the form of a ring formed on one side, and first and second string extension portions 120, 121 that extend to the other side in a bifurcated form from the loop portion 110. The loop string 100 may be hung on a support positioned above in a manner that it is passed over from above, and the loop portion 110 is pulled downward to connect to a loop fixing stopper 200 to form a knot that fixes the loop string 100 to the support 10.

[0024] Ends 125 of the first and second string extensions 120, 121 are fixed to a pulley 300. In this specification, a loop string 100 refers to a string having a loop-shaped loop portion 110 in the middle, where the portion of a single string bent to form a loop becomes the loop portion 110, and the portions branching out and extending from the loop portion 110 become the first and second string extensions 120, 121. In this specification, the term "string" is used as a concept that includes strings, ropes, cables, and the like, and similar items.

[0025] The pulley 300 includes a pulley wheel 310 and a pulley housing 320 .

[0026] The pulley housing 320 includes two connecting plates 322 facing each other, and the pulley wheel 310 is disposed between the two connecting plates 322 and rotatably supported by a connecting shaft 328 .

[0027] A string connecting portion 325 to which both ends 125 of the loop string 100 are fixed is formed on the upper surface of the pulley housing 320. The string connecting portion 325 may be formed as through-holes through which the first and second string extension portions 120 and 121 pass, respectively.

[0028] Both end portions 125 of the loop string 100, i.e., the end portions 125 of the first and second string extensions 120, 121, enter and are fixed inside the pulley housing 320 via the string connecting portion 325. The end portions 125 of the loop string 100 may be tied inside the pulley housing 320 to form knots, or may be fixed by connecting a fastener. In this way, the loop string 100 may be connected so as not to come off the pulley housing 320.

[0029] At the top of the interior of the pulley housing 320, a coupling space 324 is formed between the pulley wheel 310 and the upper end of the pulley housing 320 where the string coupling part 325 is formed, so that the rotation of the pulley wheel 310 is not hindered by the knot or fastener formed on the end 125 of the loop string 100.

[0030] The pulley wheel 310 has a groove 312 formed therein through which the moving string 400 passes in a circumferential direction. The moving string 400 is hooked onto the groove 312 to change direction, and when the moving string 400 is pulled to one side or the other, the pulley wheel 310 rotates along with the movement of the moving string 400. The string connected to the pulley wheel 310 is referred to as the moving string because it moves together with the pulley wheel 310.

[0031] The loop locking stopper 200 is movably coupled to the first and second string extensions 120 , 121 of the loop string 100 .

[0032] The loop string 100 is changed direction while being hung over the support base 10, thereby extending downward together with the loop portion 110 and the first and second string extensions 120, 121. The loop portion 110, pulled to the position of the loop fixing stopper 200, is hooked onto the loop fixing stopper 200 and comes into contact with the first and second string extensions 120, 121, forming a knot that secures the loop string 100. When the loop fixing stopper 200 is moved along the first and second string extensions 120, 121, the position, i.e., the height, of the pulley 300 fixed to the first and second string extensions 120, 121 is adjusted.

[0033] 4 and 5 are a front F perspective view and a rear B perspective view of a loop fixing stopper according to an embodiment of the present invention.

[0034] 1 to 5, the loop fixing stopper 200 includes a main plate 210 and two side walls 220 protruding from the side ends of the main plate 210 toward the rear surface B.

[0035] First and second through-hole rows 211, 212 are formed on the left and right sides of the main plate 210. Each of the first and second through-hole rows 211, 212 includes at least one through-hole extending from the front face F to the rear face B and into which the first and second string extensions 120, 121 are inserted.

[0036] According to an embodiment of the present invention, the first and second rows of through-holes 211, 212 include upper through-holes 211a, 212a and lower through-holes 211b, 212b.

[0037] The first and second rows of through holes 211, 212 form paths through which the first and second string extensions 120, 121 extend, respectively. As can be seen from the enlarged view of FIG. 1 , the upper through holes 211a, 212a form paths through which the first and second string extensions 120, 121 pass from the rear surface B of the main plate 210 to the front surface F. The lower through holes 211b, 212b form paths through which the first and second string extensions 120, 121, which are drawn out to the front surface F through the upper through holes 211a, 212a, pass from the front surface F to the rear surface B. The first and second string extensions 120, 121 extend through the lower through holes 211b, 212b toward the pulley 300 and are fixed to the pulley 300 via the string coupling portion 325.

[0038] When a knot is formed to fix the loop string 100 using the loop fixing stopper 200 as a medium, the side walls 220 fix the loop portion 110 between them, preventing it from coming off.

[0039] FIG. 6 is a diagram illustrating a process in which the loop portion of the loop string is coupled to and fixed by the loop fixing stopper.

[0040] 6, first, the loop portion 110 of the loop string 100 is placed over the support base 10 so that it is hung on the support base 10, and then the loop portion 110 is pulled to the position of the loop fixing stopper 200. Thereafter, the loop portion 110 is moved to the rear side of the loop fixing stopper 200, and then the pulley 300 is pulled downward.

[0041] 2, the loop portion 110 passes from the rear surface B of the loop fixing stopper 200 through the first and second rows of through-holes 211, 212 and is then hooked onto the first and second string extensions 120, 121 extending downward. In other words, the loop portion 110 is interposed between the rear surface B of the loop fixing stopper 200 and the first and second string extensions 120, 121, and the first and second string extensions 120, 121, which have passed through the first and second rows of through-holes 211, 212, pass through the loop portion 110 and extend downward.

[0042] When the pulley 300 to which the first and second string extensions 120, 121 are connected is pulled, downward tension acts on the first and second string extensions 120, 121 and upward tension acts on the loop portion 110, causing tightening that secures the loop portion 110. In this specification, the fixing of the loop string 100 using the loop fixing stopper 200 as described above is referred to as the formation of a knot. According to the present invention, the loop portion 110 extends between the side walls 220, preventing the loop portion 110 from opening outward. The loop portion 110 and the first and second string extensions 120, 121 interfere with each other, causing jamming and firmly securing the knot.

[0043] Since the loop string 100 is fixed by the knot formed by the loop fixing stopper 200, the pulley 300 can maintain a state in which it is suspended from the support base 10 by the loop string 100 at the adjusted position.

[0044] 7A and 7B are diagrams illustrating adjustment of the length of the loop string and adjustment of the height of the pulley by moving the loop fixing stopper. Fig. 7A shows the state in which the loop fixing stopper 200 has moved upward along the first and second string extensions 120 and 121, and Fig. 7B shows the state in which the loop fixing stopper 200 has moved downward along the first and second string extensions 120 and 121 to a position visible in Fig. 7A.

[0045] As shown in Figure 7(a), when the loop fixing stopper 200 moves downward along the first and second string extensions 120 and 121, the overlapping length of the loop string 100 above the loop fixing stopper 200 increases. Therefore, the length of the loop string 100 extending downward decreases, and the pulley 300 located below the loop fixing stopper 200 rises. Conversely, as shown in Figure 7(b), when the loop fixing stopper 200 moves upward along the first and second string extensions 120 and 121, the overlapping length of the loop string 100 above the loop fixing stopper 200 decreases. Therefore, the length of the loop string 100 extending downward increases, and the pulley 300 located below the loop fixing stopper 200 descends.

[0046] According to the present invention, after the loop string 100 is hung on the support base 10, the loop portion 110 is hung on the loop fixing stopper 200 to tie a knot for fixing the loop string 100, which makes it easy to suspend the pulley 300 in the air. In addition, by moving the loop fixing stopper 200 along the first and second string extensions 120 and 121, the distance between the support base 10 and the pulley 300 can be easily adjusted. Therefore, the height at which the pulley 300 is suspended in the air can be easily adjusted.

[0047] 8 shows an example of a pulley device according to an embodiment of the present invention implemented as an arm stretching exercise device. The pulley device according to an embodiment of the present invention further includes a moving string and a handle, allowing for arm stretching exercises.

[0048] 8, a moving string 400 is hung in the groove 312 of the pulley wheel 310 and extends to both sides, forming moving string extensions 401 and 402. Handles 451 and 452 are fixed to the respective moving string extensions 401 and 402.

[0049] When one side handle 451 is pulled, the moving string 400 moves with the rotation of the pulley wheel 310, and the other side handle 452 rises. Therefore, the arm holding the other side handle 452 is stretched. In the opposite case, the arm holding the one side handle 451 is stretched. In this way, by alternately pulling the one side and the other side handles 451, 452, stretching exercises for both arms can be performed.

[0050] The handles 451 and 452 on one side and the other side are formed with a hollow 455 so that the moving string extensions 401 and 402 can pass through.

[0051] According to an embodiment of the present invention, a string stopper 500 is included that connects the one-side and other-side handles 451, 452 to the moving string extensions 401, 402. The string stopper 500 is positionally adjustable along the moving string extensions 401, 402, thereby adjusting the height of the one-side and other-side handles 451, 452.

[0052] FIG. 9 is a cross-sectional view of a string stopper of a pulley device according to one embodiment of the present invention, and FIG. 10 is a diagram illustrating the adjustment of the handle height using the string stopper shown in FIG. 9.

[0053] 9, a path through which the moving string extensions 401 and 402 pass is formed inside the main body 510 of the string stopper 500. The path includes an insertion hole path 520 through which the moving string extensions 401 and 402 extending downward from the pulley 300 pass while bending multiple times inside the main body 510 and then exiting to the outside of the main body 510, and a fixing hole path 530 into which the ends 405 of the moving string extensions 401 and 402 passing through the hollows 455 of the one and other handles 451 and 452 are inserted and fixed.

[0054] The main body 510 may have a triangular shape with a rounded apex, and may be made of a plastic material.

[0055] The insertion hole path 520 includes a first insertion hole 522 formed in the upper part of the main body 510 and extending downward, a first side insertion hole 524 bent relative to the first insertion hole 522 and extending to one side of the main body 510, and a second insertion hole 526 bent relative to the first side insertion hole 524 and extending downward. The first side insertion hole 524 extends perpendicular to the first insertion hole 522, and the second insertion hole 526 extends perpendicular to the first side insertion hole 524. The second insertion hole 526 has an outer wall 526a that is shorter than the inner wall 526b, so that the moving string extensions 401, 402 that pass through the second insertion hole 526 extend outward toward the one and other side handles 451, 452, opening outward. However, the present invention is not limited thereto.

[0056] A connection portion 525 between the first side insertion hole 524 and the second insertion hole 526 is formed to be open on one side of the body 510. Also, a second side insertion hole 528 is included which is connected to the first side insertion hole 524 and extends toward the other side of the body 510.

[0057] The moving string extensions 401, 402 extending from the pulley 300 are inserted through the first insertion hole 522, bent, and inserted into the first side insertion hole 524. Because the first side insertion hole 524 extends perpendicular to the first insertion hole 522, the end of the moving string 400 inserted into the first insertion hole 522 does not easily enter the first side insertion hole 524. At this time, a tool can be inserted into the second side insertion hole 528 to insert the moving string extensions 401, 402 into the first side insertion hole 524. The moving string extensions 401, 402 inserted through the first side insertion hole 524 can be pulled to the outside of the main body 510 through the opened connecting portion 525. The moving string extensions 401, 402 are then inserted into the second insertion hole 526 and pulled downward. This causes the moving string extensions 401, 402 to exit the body 510 and extend towards the handles 451, 452 on one side and the other side.

[0058] Along the insertion hole path 520, the moving string extensions 401, 402 bend as they pass through the first insertion hole 522, first side insertion hole 524, and second insertion hole 526, and are then ejected to the outside of the main body 510. Friction occurs at the boundaries of the first insertion hole 522, first side insertion hole 524, and second insertion hole 526 where the moving string extensions 401, 402 bend, and this friction point f serves to strengthen the fixing effect of the moving string 400 when tension is applied to the moving string 400. Because the friction point f is formed by bending inside the main body 510, it is possible to prevent the moving string extensions 401, 402 from slipping even when a large force is applied to the handles 451, 452 on one side and the other side.

[0059] The movable string extensions 401 and 402 discharged from the string stopper 500 pass through the hollows 455 of the handles 451 and 452 on one side and the other side, and the ends 405 are inserted into the paths 530 of the fixing holes of the string stopper 500 and fixed.

[0060] The fixing hole path 530 includes an end fixing hole 532 formed in the lower part of the main body 510 and to which the end 405 of the moving string extension parts 401 and 402 is fixed, and an end insertion hole 534 that crosses and connects to the end fixing hole 532 and extends toward the other side of the main body 510. The end fixing hole 532 and the first insertion hole 522 are disposed on the central axis of the main body 510. The other side of the main body 510 on which the end insertion hole 534 is formed forms an opening 536 that is open toward the bottom and the side. The opening 536 is located opposite the second insertion hole 526.

[0061] The moving string extensions 401, 402 are inserted into the end fixing holes 532 through the openings 536 and the end insertion holes 534 on the other side of the main body 510. The ends 405 of the moving string extensions 401, 402 are tied to form knots or are connected to a fastener and placed in the end fixing holes 532 to prevent separation. This completes the process of connecting the one-side and other-side handles 451, 452 to the moving string extensions 401, 402.

[0062] The opening 536 formed on the other side of the main body 510 allows the moving string extensions 401 and 402 inserted into the end insertion holes 534 to extend symmetrically on the left and right sides of the string stopper 500. Therefore, the moving string extensions 401 and 402 on the lower side of the main body 510 can be arranged symmetrically with respect to the central axis of the string stopper 500.

[0063] Since the moving string 400 extends while being folded multiple times inside the main body 510 of the string stopper 500, when tension is generated in the moving string 400, the frictional force increases, and the effect of fixing the moving string is improved.

[0064] 10 , the positions of the one-side and other-side handles 451, 452 can be adjusted by moving the movable string 400 along the insertion hole path 520. As can be seen from FIG. 10( a), when the string stopper 500 is moved downward along the movable string extensions 401, 402, the overlapping length of the movable string extensions 401, 402 between the string stopper 500 and the one-side and other-side handles 451, 452 decreases, thereby adjusting the positions of the one-side and other-side handles 451, 452 downward. Conversely, as can be seen from FIG. 10( b), when the string stopper 500 is moved upward along the movable string extensions 401, 402, the overlapping length of the movable string extensions 401, 402 between the string stopper 500 and the one-side and other-side handles 451, 452 increases, thereby adjusting the positions of the one-side and other-side handles 451, 452 upward. In this manner, the height of the handles 451 and 452 on one side and the other side can be adjusted to suit the user's body size.

[0065] The string stopper 500 according to the present invention has a beautiful appearance because the moving string 400 is broken while passing through the inside of the main body 510 and the broken part is not exposed to the outside. In addition, since the main body 510 can be made of a plastic material and still have sufficient rigidity, the manufacturing cost can be reduced compared to stoppers made of metal.

[0066] It is to be reiterated that the scope of protection of this field is not limited to the description and expression of the embodiments explicitly described above, and that the scope of protection of the present invention is not limited by obvious modifications or substitutions in the technical field to which the present invention belongs.

Claims

1. a loop string having a loop portion formed in a ring shape on one side and first and second string extension portions extending from both legs of the loop portion to the other side, wherein when the loop string is hung on a support positioned above, the loop portion extends downward together with the first and second string extension portions; a loop fixing stopper having first and second rows of through holes through which the first and second string extensions pass, the loop portion of which can be hooked on a rear surface to form a knot that fixes the loop string; A pulley device comprising: a pulley housing to which ends of the first and second string extensions extending through the loop fixing stopper are connected; and a pulley including a pulley wheel rotatably mounted by a connecting shaft between connecting plates on both sides of the pulley housing and having a groove formed on its periphery through which the moving string can rotate and pass.

2. 2. The pulley device according to claim 1, wherein the loop fixing stopper is coupled to the first and second string extensions so that its position can be adjusted while moving along the first and second string extensions, thereby adjusting the position at which the pulley is suspended in the air by the loop string.

3. The first and second rows of through-holes of the loop fixing stopper are 3. The pulley apparatus of claim 2, including an upper through-hole that allows the first and second string extensions to extend from a rear surface to a front surface, and a lower through-hole that allows the first and second string extensions to extend from a front surface to a rear surface.

4. the loop fixing stopper includes a main plate in which the first and second through-hole rows are formed, and side walls protruding rearward from both sides of the main plate, 3. The pulley device according to claim 2, wherein the side walls can support the loop portions hooked between the first and second string extensions and the rear surface of the main plate so that the loop portions extend between the side walls.

5. the pulley housing includes a string coupling portion formed on an upper surface thereof with through holes into which the respective ends of the first and second string extensions are inserted; 2. The pulley device according to claim 1, wherein the ends of the first and second string extensions are fixed to prevent separation from a coupling space formed in an upper portion of the interior of the pulley housing.

6. a moving string having two moving string extensions that are threaded through the groove of the pulley wheel and extend downward; 10. The pulley device of claim 1, further comprising a handle coupled to a lower portion of each of the moving string extensions, the handle being configured to allow arm stretching movements.

7. The handle has a hollow through which the travel string extension is inserted; The moving string extension is provided with a string stopper that connects the handle and allows the height of the handle to be adjusted; The string stopper has an insertion hole path and a fixing hole path formed inside the body thereof, The insertion hole has a path such that the moving string extension is bent inside the main body and then discharged to extend toward the handle, but the moving string extension can be fixed by a frictional force formed when the moving string extension is bent inside the main body. The pulley device according to claim 6, wherein the end of the moving string extension, which extends through the hollow of the handle, is inserted into and fixed to the path of the fixing hole.

8. The path of the insertion hole is:

8. The pulley device according to claim 7, comprising: a first insertion hole formed in an upper portion of the body and extending downward; a first side insertion hole extending to one side of the body, crossing the first insertion hole; and a second insertion hole extending downward, crossing the first side insertion hole.

9. a connecting portion between the first side insertion hole and the second insertion hole is formed to be open at one side of the main body; 9. The pulley device of claim 8, further comprising a second side insertion hole connected to the first side insertion hole and extending to the other side of the body.

10. 9. The pulley device according to claim 8, wherein the path of the fixing holes includes an end fixing hole to which an end of the moving string extension is fixed, and an end insertion hole that intersects the end fixing hole, extends toward the other side of the body, and into which the end of the moving string extension is inserted.

11. The path of the first insertion hole and the end fixing hole are arranged on the central axis of the main body; 11. The pulley device of claim 10, wherein the moving string extensions below the body form a symmetrical arrangement about a central axis of the body.

12. The pulley device according to claim 11, wherein the body has an opening formed on the opposite side of the second insertion hole through which the moving string extension passes.

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